Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b6b70b26b64cbf3…

MALICIOUS

PDF

71.4 KB Created: 2021-10-02 09:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0a1cdec7f43f8af567ffa5044680e0a2 SHA-1: 537ed95482d7808566c039d1ceb7fa4649fab222 SHA-256: 7b6b70b26b64cbf36c032135ae83975e4f65b85dd6d4e51f35d6ba4cdb239d8e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The embedded JavaScript and numerous external URIs suggest an attempt to redirect users to potentially malicious websites. The primary attack pattern involves luring users to these external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://synerhu.ru/uplcv?utm_term=digital+tv+questions+and+answers PDF link annotation
    • http://kimwendelldesign.com/ckfinder/userfiles/files/fakavusumajadizikized.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/bizewaxepu.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/gizoveguwazazezob.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/vanebizuwafufixapezogite.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/58822959648.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/tapudezepegojovuwemeb.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/69790428045.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/33839103044.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/favimutijamabug.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/87594005686.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/koladigifogodip.pdfIn PDF document text
    • http://m2m2design.com/userfiles/71914817248.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/29498234168.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613510e7bcb03---40157711411.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/besomaxopofofaba.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/823550451.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/77955692586.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/sosuve.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/notijonodu.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/siwimovixipaxofaze.pdfIn PDF document text
    • http://spiregene.com/image/files/20210927_090245.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/pumapipadisimatowa.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/voxafo.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/rofirunuwa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB17 10824 bytes
SHA-256: 208dfe52647da222f9ca4e36f31dbf319abf806b2181f24dea1febe1b53f1836
font_02_sfnt_off0000e3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B8 16524 bytes
SHA-256: 2d3493b26ee1c24d1c004612a9bdddcb30da302a71c3344b34e1c760d682448f

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